Lateral sacral artery
Encyclopedia
The lateral sacral arteries arise from the posterior division of the internal iliac artery
; there are usually two, a superior and an inferior.
, and, escaping by the corresponding posterior sacral foramen, is distributed to the skin and muscles on the dorsum
of the sacrum, anastomosing with the superior gluteal
.
to the medial side of the anterior sacral foramina, descends on the front of the sacrum, and anastomoses over the coccyx
with the middle sacral and opposite lateral sacral artery.
In its course it gives off branches, which enter the anterior sacral foramina; these, after supplying the contents of the sacral canal
, escapes by the posterior sacral foramina
, and are distributed to the muscles and skin on the dorsal surface of the sacrum, anastomosing with the gluteal arteries.
Internal iliac artery
The internal iliac artery is the main artery of the pelvis.-Structure:The internal iliac artery supplies the walls and viscera of the pelvis, the buttock, the reproductive organs, and the medial compartment of the thigh...
; there are usually two, a superior and an inferior.
Superior
The superior, of large size, passes medialward, and, after anastomosing with branches from the middle sacral, enters the first or second anterior sacral foramen, supplies branches to the contents of the sacral canalSacral canal
The vertebral canal runs throughout the greater part of the sacral bone; above, it is triangular in form; below, its posterior wall is incomplete, from the non-development of the laminæ and spinous processes....
, and, escaping by the corresponding posterior sacral foramen, is distributed to the skin and muscles on the dorsum
Dorsum (anatomy)
In anatomy, the dorsum is the upper side of animals that typically run, fly, or swim in a horizontal position, and the back side of animals that walk upright. In vertebrates the dorsum contains the backbone. The term dorsal refers to anatomical structures that are either situated toward or grow...
of the sacrum, anastomosing with the superior gluteal
Superior gluteal
Superior gluteal can refer to:* Superior gluteal artery* Superior gluteal veins* Superior gluteal nerve...
.
Inferior
The inferior runs obliquely across the front of the piriformis and the sacral nervesSacral nerves
The five sacral nerves emerge from the sacrum. Although the vertebral components of the sacrum are fused into a single bone, the sacral vertebrae are still used to number the sacral nerves....
to the medial side of the anterior sacral foramina, descends on the front of the sacrum, and anastomoses over the coccyx
Coccyx
The coccyx , commonly referred to as the tailbone, is the final segment of the vertebral column. Comprising three to five separate or fused vertebrae below the sacrum, it is attached to the sacrum by a fibrocartilaginous joint, the sacrococcygeal symphysis, which permits limited movement between...
with the middle sacral and opposite lateral sacral artery.
In its course it gives off branches, which enter the anterior sacral foramina; these, after supplying the contents of the sacral canal
Sacral canal
The vertebral canal runs throughout the greater part of the sacral bone; above, it is triangular in form; below, its posterior wall is incomplete, from the non-development of the laminæ and spinous processes....
, escapes by the posterior sacral foramina
Posterior sacral foramina
Lateral to the articular processes of the sacrum are the four posterior sacral foramina ; they are smaller in size and less regular in form than the anterior, and transmit the posterior divisions of the sacral nerves....
, and are distributed to the muscles and skin on the dorsal surface of the sacrum, anastomosing with the gluteal arteries.